Antique radios, Old Time Radios
4HTF4
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Country:
United States of America (USA)
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| Identical to |
4HTF4
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| Filament |
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| Description |
Ballast tube
According to AMPERITE standard coding:
4HTF4 means:
4HTF4: Threshold current ca. 0.4 A
4HTF4: 220 - 240 V, AC - DC - sets
4HTF4: 9-pin miniature base
4HTF4: Threshold voltage ca. 4V
The "Ballast Tube Handbook" states: 4.3 ... 10 V, 500 mA (see attached technical data)
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Dimensions (WHD)
incl. pins / tip |
x 65 x 20 mm / x 2.56 x 0.79 inch |
| Weight |
10 g / 0.35 oz |
| Information source |
Ballast Tube Handbook, The Amperite Ballast Tubes Catalogue 1960
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4HTF4: The Ballast Tube Handbook
Harald Giese
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4HTF4: Amperite Ballast Tubes Catalogue 1960
Harald Giese
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